iOS 蓝牙4.0开发
背景：
1.iOS的蓝牙不能用来传输文件。
2.iOS与iOS设备之间进行数据通信，使用gameKit.framework
3.iOS与其他非iOS设备进行数据通信，使用coreBluetooth.framework
iOS中蓝牙的实现方案
iOS中提供了4个框架用于实现蓝牙连接
GameKit.framework（用法简单）
只能用于iOS设备之间的连接，多用于游戏（比如五子棋对战），从iOS7开始过期
MultipeerConnectivity.framework
只能用于iOS设备之间的连接，从iOS7开始引入，主要用于文件共享（仅限于沙盒的文件）
ExternalAccessory.framework
可用于第三方蓝牙设备交互，但是蓝牙设备必须经过苹果MFi认证（国内较少）
CoreBluetooth.framework（时下热门）
可用于第三方蓝牙设备交互，必须要支持蓝牙4.0
硬件至少是4s，系统至少是iOS6
蓝牙4.0以低功耗著称，一般也叫BLE（BluetoothLowEnergy）
目前应用比较多的案例：运动手坏、嵌入式设备、智能家居
下面具体介绍使用CoreBluetooth.framework的代码步骤：
//蓝牙系统库
#import <CoreBluetooth/CoreBluetooth.h>
//必须要由UUID来唯一标示对应的service和characteristic
#define kServiceUUID @"5C476471-1109-4EBE-A826-45B4F9D74FB9"
#define kCharacteristicHeartRateUUID @"82C7AC0F-6113-4EC9-92D1-5EEF44571398"
#define kCharacteristicBodyLocationUUID @"537B5FD6-1889-4041-9C35-F6949D1CA034"
@interface ViewController ()<CBCentralManagerDelegate,CBPeripheralDelegate>
@property (nonatomic,strong)CBCentralManager * centralManager;
@property (nonatomic,strong)CBPeripheral * peripheral;
@end
1.创建中心角色
#import <CoreBluetooth/CoreBluetooth.h>
- (void)viewDidLoad
{
[super viewDidLoad];
//初始化蓝牙 central manager
_centralManager = [[CBCentralManager alloc]initWithDelegate:self queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) options:nil];
}
2.扫描外设
[manager scanForPeripheralsWithServices:nil options:@{CBCentralManagerRestoredStateScanOptionsKey:@(YES)}];
3.连接外设
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
if([peripheral.name isEqualToString:BLE_SERVICE_NAME]){
[self connect:peripheral];
}
s);
}
-(BOOL)connect:(CBPeripheral *)peripheral{
self.manager.delegate = self;
[self.manager connectPeripheral:peripheral
options:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:CBConnectPeripheralOptionNotifyOnDisconnectionKey]];
}
4.扫描外设中的服务和特征
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
NSLog(@"Did connect to peripheral: %@", peripheral);
_testPeripheral = peripheral;
[peripheral setDelegate:self]; <br>//查找服务
[peripheral discoverServices:nil];
}
发现服务：
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
NSLog(@"didDiscoverServices");
if (error)
{
NSLog(@"Discovered services for %@ with error: %@", peripheral.name, [error localizedDescription]);
if ([self.delegate respondsToSelector:@selector(DidNotifyFailConnectService:withPeripheral:error:)])
[self.delegate DidNotifyFailConnectService:nil withPeripheral:nil error:nil];
return;
}
for (CBService *service in peripheral.services)
{
//发现服务
if ([service.UUID isEqual:[CBUUID UUIDWithString:UUIDSTR_ISSC_PROPRIETARY_SERVICE]])
{
NSLog(@"Service found with UUID: %@", service.UUID); <br>//查找特征
[peripheral discoverCharacteristics:nil forService:service];
break;
}
}
}
发现服务中的特征：
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
if (error)
{
NSLog(@"Discovered characteristics for %@ with error: %@", service.UUID, [error localizedDescription]);
[self error];
return;
}
NSLog(@"服务：%@",service.UUID);
for (CBCharacteristic *characteristic in service.characteristics)
{
//发现特征
if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"xxxxxxx"]]) {
NSLog(@"监听：%@",characteristic);<br>//监听特征
[self.peripheral setNotifyValue:YES forCharacteristic:characteristic];
}
}
}
5.与外设进行数据交互
读取数据：
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
if (error)
{
NSLog(@"Error updating value for characteristic %@ error: %@", characteristic.UUID, [error localizedDescription]);
self.error_b = BluetoothError_System;
[self error];
return;
}
// NSLog(@"收到的数据：%@",characteristic.value);
[self decodeData:characteristic.value];
}
写数据：
NSData *d2 = [[PBABluetoothDecode sharedManager] HexStringToNSData:@"0x02"];
[self.peripheral writeValue:d2 forCharacteristic:characteristic type:CBCharacteristicWriteWithoutResponse];
